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    • 9. 发明授权
    • Process for the preparation of 2-amino-5-methyl-pyridine
    • 2-氨基-5-甲基 - 吡啶的制备方法
    • US5332824A
    • 1994-07-26
    • US43648
    • 1993-04-06
    • Eric RivadeneiraKlaus Jelich
    • Eric RivadeneiraKlaus Jelich
    • C07D213/73C07D213/74C07D213/89C07D213/18C07D213/20
    • C07D213/73C07D213/74
    • The invention relates to a novel process and novel intermediates for the preparation of 2-amino-5-methylpyridine (I) ##STR1## The process is characterized in that in a first step 3-methyl-pyridine 1-oxide of the formula (II) ##STR2## is reacted with a trialkylamine of the general formula (III)R.sub.3 N (III)in whichR represents alkyl,and with an electrophilic compound, in the presence or absence of a diluent, to give the ammonium salt of the general formula (IV) ##STR3## in which R has the abovementioned meaning andZ.sup..crclbar. represents an anion formed from an electrophilic compound, the compound (IV)is, possibly, isolated as a crude intermediate and, possibly, further purified and then in a second step the ammonium salt of the formula (IV) is reacted with hydrogen bromide, in the presence or absence of a diluent, at temperatures between 150.degree. C. and 300.degree. C.The compound (I) is an intermediate for the preparation of agrochemicals, for example of herbicides.
    • 本发明涉及一种用于制备2-氨基-5-甲基吡啶(I)的新方法和新型中间体(I)。该方法的特征在于在第一步中,将3-甲基 - 吡啶-1-氧化物 式(II)与存在或不存在稀释剂的通式(III)的通式(III)R3N(III)的三烷基胺反应,其中R表示烷基,并与亲电子化合物反应,得到 通式(IV)的铵盐其中R具有上述含义,Z( - )表示由亲电子化合物形成的阴离子,化合物(IV)可能被分离为粗中间体 并且可能进一步纯化,然后在第二步中,在存在或不存在稀释剂的情况下,在150℃至300℃的温度下,使式(IV)的铵盐与溴化氢反应。化合物 (I)是用于制备农药的中间体,例如除草剂。